CN115165242B - Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced subsidence - Google Patents
Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced subsidence Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/182—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for tubes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/16—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces applied through gearing
- G01N3/165—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces applied through gearing generated by rotation, i.e. centrifugal force
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Abstract
The invention discloses a centrifugal test device and a centrifugal test method for simulating ground subsidence induced by reciprocating leakage of a buried pipeline, and belongs to the field of civil engineering. The main structure comprises a box body with a transparent window at the front side, wherein the inside of the box body is composed of a bin partition plate, a damaged pipeline model, a water level control water permeable plate outside the pipe, a water-sand separation device and the like. The front part of the device is divided into a test soil bin for filling a model soil body and seepage bins at two sides; the rear part of the device is divided into a soil filtering bin and water circulation replenishing bins at two sides. The front end of the damaged pipeline model is provided with a motor push rod for controlling the opening and closing of a damaged notch of the pipeline, and the rear part of the damaged pipeline model is provided with a ball valve device and connected with a water pump. According to the invention, the shrinkage scale and the shrinkage effect of the geotechnical centrifugal model test in the Ng super-gravity field are utilized, the ball valve device is adopted to realize the reciprocating seepage hydraulic conditions of the water in the pipe and the water out of the pipe, and the motor push rod is utilized to control the size of the breakage notch, so that the evolution process of ground collapse caused by the damage of the buried pipeline under the real stress level can be reproduced.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a centrifugal test device and method for simulating ground subsidence induced by reciprocating leakage of a buried pipeline.
Background
With the continuous improvement of urban efficiency in China, buried pipelines such as rainwater pipelines, communication pipelines and the like are important infrastructure for guaranteeing urban functions. Due to the reasons of out-of-service, manufacturing defects, construction disturbance and the like, buried pipelines are extremely easy to damage at pipe walls, pipeline interfaces and the like. In areas with abundant hydraulic conditions, such as areas with high groundwater level and areas with large precipitation in rainy season, the soil body of the foundation runs off through damaged pipelines due to the water flow infiltration outside the pipe. When the precipitation is large, the pipe flow is full, so that the water flow extravasation aggravates the soil body degradation. Along with the reciprocating seepage action of the extravasation and the internal seepage, the seepage erosion in foundation soil is continuously developed, the mechanical property of soil body is deteriorated, and serious consequences such as foundation instability collapse and the like can occur under the action of external load. The disasters have the characteristics of concealment, burstiness and the like, are more frequent in urban areas, and particularly in areas with concentrated population living, industrial areas with developed underground pipe networks and the like. Such disasters, once occurring, can lead to not only significant loss of life and property, but also to greater social public opinion. The ground collapse disaster caused by the buried pipeline damage has strong concealment and serious consequences, and the damage rate is improved and the disaster occurrence risk is increased along with the long-term service of the pipeline. The process of the ground collapse disaster induced by the buried pipeline breakage has great difference with the traditional foundation instability mechanism, is closely related to soil seepage erosion, is insufficient in related research on the damage mechanism at present, and lacks effective prevention and control means.
In the scientific research field, physical simulation tests are important means for finding objective properties of things and revealing development rules of things. The relative purposes of reducing the scale, reducing the time and restoring the real stress state can be achieved by utilizing the hypergravity technology. Therefore, the centrifugal machine is used for providing supergravity, so that the problems related to the ground sinking caused by the damage of the buried pipeline under the reciprocating leakage are researched, and the pore water pressure and the ground deformation evolution rule in the ground collapse process can be revealed. At present, a centrifugal model test device for simulating ground collapse induced by a damaged buried pipeline under reciprocating leakage by using a supergravity method is not found.
Disclosure of Invention
The invention aims to provide a supergravity centrifugal model test device and a supergravity centrifugal model test method capable of reproducing the ground collapse triggering and evolution process of a damaged buried pipeline under the reciprocating leakage condition under the action of a real stress level.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a centrifugal test device for simulating a buried pipeline reciprocating leakage induced subsidence, which comprises a model box body, a damaged pipeline model, a servo control system and a monitoring and sensing system, wherein the model box body is divided into a front part and a rear part by a bin partition plate, and the bin partition plate is provided with a mounting hole for fixing the damaged pipeline model;
the front part in the model box body is provided with a test soil bin and seepage bins at two sides of the test soil bin, and the front end position of the damaged pipeline model in the test soil bin is provided with a damage gap with adjustable size; the rear part in the model box body is provided with a soil filtering bin and water circulation replenishing bins at two sides of the soil filtering bin, the rear end position of the damaged pipeline model in the soil filtering bin is provided with a water inlet and outlet control device, and a water and sand separation device is arranged below the water inlet and outlet control device; the bin partition plate is provided with a water level limiting hole which is communicated with the seepage bin and the water circulation replenishing bin;
the servo control system is used for controlling the size of a damaged gap and the internal and external water levels of the damaged pipeline model; the monitoring and sensing system is used for measuring the soil pressure, the water pressure and the soil surface displacement of the test soil bin in real time and the strain condition of the water-sand separation device of the soil filtering bin.
Further, the damaged pipeline model comprises a pipeline main body, a pipeline front end sealing cover, a pipeline rear end sealing cover and an electric push rod assembly; the pipeline main body is fixed in the mounting hole of the bin partition plate through the flange plate, the front end sealing cover and the rear end sealing cover of the pipeline are respectively used for sealing the front end and the rear end of the pipeline main body, and the breakage notch is positioned on the pipeline main body and is close to the front end sealing cover of the pipeline; the electric push rod assembly is arranged on the inner side of the sealing cover at the front end of the pipeline, and the size of the damaged gap is adjusted through the rubber plug at the end part of the electric push rod.
Further, the water inlet and outlet control device adopts a ball valve device which is arranged on a sealing cover at the rear end of the pipeline and used for switching water inlet and water outlet of the damaged pipeline model.
Further, the soil filtering bin and the water circulation replenishing bin at two sides of the soil filtering bin are separated by a pair of baffles, and holes for communicating the soil filtering bin and the water circulation replenishing bin are formed in the bottoms of the baffles; the water-sand separation device is fixed in the soil filtering bin through a baffle plate and is positioned below the damaged pipeline model.
Further, the water-sand separation device is one or more layers of filter plates.
Further, a submersible pump is arranged in the water circulation replenishment bin, and the submersible pump is respectively connected with a water inlet and outlet control device of the damaged pipeline model and the seepage bin through a controllable water outlet pipeline.
Further, the monitoring sensing system comprises a strain monitoring assembly, a pore pressure sensor, a soil pressure sensor, a laser displacement sensing device and a high-speed camera assembly;
the hole pressure sensor and the soil pressure sensor are buried in the soil body of the test soil bin in a layered manner in a linear array manner; the laser displacement sensing device is arranged above the test soil bin in a linear array manner and is used for measuring the soil surface displacement in the test soil bin; the strain monitoring component is arranged on the water-sand separation device and is used for measuring the strain condition of the water-sand separation device; the high-speed camera component is arranged at a visible window of the front plate of the box body.
Further, the servo control system comprises a servo controller and a plurality of servo actuators, wherein each servo actuator is used for adjusting the circulating water quantity and the flow direction of the water circulation replenishment bin, switching the water inlet and the water outlet functions of the water inlet and outlet control device and adjusting the size of a damaged notch of the damaged pipeline model.
The invention has the beneficial effects that:
1. according to the invention, the water pump and the servo control system are formed by the submersible pump, the water pressure gauge and the servo control system, and the water circulation replenishing bin, the water permeable plate and the ball valve device are connected in parallel to realize water flow recycling of the test device, and the water level heights inside and outside the pipe can be respectively adjusted in real time.
2. The invention creatively provides a soil body reciprocating leakage simulation technology under the hypergravity condition, reflects the real stress states and the real hydraulic conditions of the damaged buried pipeline in different seasons and different regions according to the hypergravity test experience, and realizes the geotechnical centrifugal buried pipeline model reciprocating leakage technology.
3. The invention provides a real-time monitoring technology for soil particle escape under a supergravity state, a soil material filtering bin for separating a water-soil mixture is arranged according to a mechanical principle, and a strain detection assembly is arranged on a filter plate, so that a real-time detection curve reflecting the soil particle escape condition can be accurately obtained.
4. According to the invention, the high-speed camera is arranged to shoot the test process through the transparent window, and the quantitative analysis is carried out on the soil state under the condition of pipe damage by combining with the image velocimetry (PIV), so that the deformation trend of the soil in the test soil bin can be accurately reflected.
5. The invention realizes dynamic measurement of pore water pressure evolution in foundation soil by embedding the pore pressure sensor so as to assist in correcting the work of the water circulation system. The laser displacement sensor is utilized to monitor the surface deformation of foundation soil, and the soil body pore pressure-displacement relation can be obtained through the combined analysis of the pore pressure sensor and the laser displacement sensor data.
6. The invention can realize flexible simulation of damaged pipeline damage ports, the size and the direction of the damaged pipeline damage ports can be adjusted by changing the connection angle of the pipeline and the bin partition plate, and the application range is wide. All water circulation and soil particle migration occur inside the model box, and no mass communication exists between the model box and the outside, so that large changes of physical parameters such as mass, centroid and the like can not be generated, the influence on the working state of the geotechnical centrifuge is small, and the design stability and accuracy are more advantageous.
In summary, the invention provides an analysis method and test support for revealing the problems related to the change trend of soil deformation, pore water pressure and the like in the problem of foundation collapse induced by damaged pipelines by providing the internal erosion and destabilization process of foundation soil under the condition of changing the hydraulic condition through a centrifugal device based on the supergravity model test.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a test device according to an embodiment of the present invention;
FIG. 2 is a top view of a test device provided by an embodiment of the present invention;
FIG. 3 is a schematic view of the back side of a test apparatus (with back plate removed) according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a simulated damaged pipe;
FIG. 5 is a schematic diagram of the front side of a test apparatus (with the front panel of the case and the high-speed camera assembly hidden) provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of a laser displacement sensing device according to an embodiment of the present invention;
FIG. 7 is a schematic view of a ball valve assembly according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a filter plate and strain detection assembly according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of the operation provided by an example of the present invention;
in the figure: 1-model box body, 101-box body front plate, 1011-visible window, 102-box body left side plate, 103-box body right side plate, 104-box body back plate, 105-box body bottom plate and 106-fixed clamping plate; 2-damaged pipeline model, 201-pipeline main body, 202-damaged notch, 203-pipeline front end sealing cover, 204-pipeline rear end sealing cover, 205-ball valve device, 206-electric push rod assembly, 207-flange plate and 207-rubber plug; 301-strain monitoring components, 302-pore pressure sensors, 303-soil pressure sensors, 304-laser displacement sensing devices, 3041-laser displacement sensor connecting rods, 3042-laser displacement sensors and 305-high-speed camera components; 4-bin partition plate, 401-water level defining hole; 5-a water permeable plate; 6, a baffle plate; 7-a filter plate; 8-a test soil bin; 9-seepage bin; 10-a soil filtering bin; 11-a water circulation replenishment bin; 12-submersible pump.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
The relative purposes of reducing the scale, reducing the time and restoring the real stress state can be achieved by utilizing the hypergravity technology. According to the invention, the centrifugal machine is used for providing supergravity, so that problems related to ground sinking caused by buried pipeline breakage in a reciprocating leakage state are researched, and pore water pressure and ground deformation evolution rules in the ground collapse process can be revealed. At present, a centrifugal model test device for simulating ground collapse induced by a damaged buried pipeline in a reciprocating leakage state by using a supergravity method is not found. The above objects can be better achieved by the present embodiment, and the following detailed description will be given with reference to the accompanying drawings.
As shown in fig. 1 and 2, the centrifugal test device for simulating the sinking induced by the reciprocating leakage of the buried pipeline provided by the embodiment comprises a model box body 1, a damaged pipeline model 2, a servo control system and a monitoring and sensing system, wherein the model box body is divided into a front part and a rear part by a bin partition plate 4, and the bin partition plate 4 is provided with a mounting hole for fixing the damaged pipeline model.
In the embodiment, the model box 1 comprises a box front plate 101 with a visual window 1011, a box back plate 104, a box right side plate 103, a box left side plate 102 and a box bottom plate 105, which form a model box, are all made of steel structures and can ensure that the deformation and strength of the model box meet the requirements of Ng gravity acceleration and a bearing test model, and the model box can be mounted on a centrifuge basket; in addition, a fixing clip 106 is provided on the model housing 1 for fixing the model housing and the internal structure. The high-speed camera assembly 305 is installed outside the visual window 1011, and the test process can be shot in real time, and the structure of the high-speed camera assembly 305 is composed of a lamp strip for light supplement, a high-speed camera for shooting and an installation kit.
The inner structure of the model box body consists of a bin partition plate 4, a pair of water permeable plates 5 and a pair of baffle plates 6, and all plates are connected by bolts so as to facilitate experimental adjustment. Wherein, the bin separation plate 4 divides the interior of the model box body into a front part and a rear part, and the bin separation plate 4 is provided with a mounting hole for fixing a damaged pipeline model; the front part in the model box body is divided into a test soil bin 8 and seepage bins 9 at two sides of the test soil bin by a pair of water permeable plates 5, the water permeable plates can eliminate the scouring action of water flow on soil bodies, the boundary effect of the water flow entering the test soil bin from the seepage bins is reduced, and the underground water seepage state under the real condition can be well reflected; the rear part in the model box body is divided into a soil filtering bin 10 and water circulation replenishing bins 11 at two sides of the soil filtering bin by a pair of baffles 6, holes communicated with the soil filtering bin 10 and the water circulation replenishing bins 11 are formed in the bottoms of the baffles, and water level limiting holes 401 communicated with the seepage bins 9 and the water circulation replenishing bins 11 are formed in the bin partition plate 4.
As shown in fig. 3, submersible pumps 12 are installed in the water circulation replenishment cabins at two sides, the submersible pumps 12 are respectively connected with a water inlet and outlet control device of the damaged pipeline model and the seepage cabin 9 through controllable water outlet pipelines, and the water level of the seepage cabin can be adjusted through the height of the water level limiting holes 401, so that the purpose of controlling the water level outside the pipelines is achieved. The height adjustment of the water level limiting holes can be realized by adopting the prior art, for example, the water level limiting holes with different heights can be arranged, the water inlet and outlet control device can be realized by adopting a ball valve device 205, and the ball valve device is arranged on a sealing cover 204 at the rear end of the pipeline and is used for switching the water inlet and the water outlet of the damaged pipeline model 2.
The soil material filtering bin is internally provided with a water-sand separation device for carrying out graded filtration on a water-sand mixture flowing out of an analog damaged pipeline, the purpose of the water-sand separation device is that soil particles can be blocked by a filter plate group and water flow can freely pass through the soil particles, so that the lost soil particles are collected by the filter plate group in a graded mode, and the filtered water meets the requirement of water quality of water entering the submersible pump, thereby facilitating analysis on particle escape behaviors, and the water-sand separation device can be fixed through preset jacks on two side baffles.
As shown in (a) - (c) of fig. 4, the damaged pipe model is composed of a pipe main body 201, a pipe front end sealing cover 203, a pipe rear end sealing cover 204 and an electric push rod assembly 206, wherein the pipe main body 201 is connected with a bin partition plate 4 through a flange 207 and bolts, the front part of the pipe main body is positioned in a test soil bin 8, and the rear part is positioned in a soil filtering bin 10; the pipe main body 201 is provided with a damage notch 202, the damage notch 202 is arranged at one side close to the transparent visual window, and the seepage path can only pass through the damage notch. Those skilled in the art can replace damaged pipe models of different sizes, rigidities, etc. as needed.
The electric push rod assembly can be mounted on the sealing cover at the front end of the pipeline through bolts, and the push rod jacking pipe of the electric push rod assembly is covered with the high-density rubber plug 207 so as to achieve the extrusion waterproof effect. In this embodiment, the direction of the broken notch 202 can be achieved by changing the installation angle of the simulated damaged pipe body, and the size and shape of the broken notch 202 can be achieved by changing the pressing force of the rubber stopper 207 at the end of the electric push rod to the broken notch 202. For example, because the damaged pipeline model is detachably connected with the bin partition plate, the pipeline main body 201 is installed on the bin partition plate 4 after rotating a certain angle along the pipeline axial direction, and the direction of the damaged notch 202 can rotate along with the rotation of the pipeline main body 201, so that the purpose of adjusting the direction of the damaged notch 202 at the front end of the damaged pipeline model 2 is realized; the size of the broken notch 202 at the front end of the damaged pipeline model 2 is adjusted through the extrusion force of the rubber plug 207 at the end of the electric push rod to the broken notch 202, the broken notch 202 is completely blocked under the condition of complete extrusion, and the rubber plug 207 and the broken notch 202 are gradually separated under the condition of gradually reducing the extrusion force, so that the adjustment of the size and the shape of the broken notch 202 is realized, different working conditions can be simulated, and the repairable modification of a test form is ensured on the basis of not changing excessive equipment.
As shown in fig. 5, the test soil bins and the seepage bins on both sides thereof located in the middle area are separated by a pair of water permeable plates; the front end of the damaged pipeline model is positioned in a test soil bin, a tested soil sample is filled in the test soil bin during a test, and the filling height can be determined according to the test. In this embodiment, a pair of porous plates symmetry sets up, and its material is the porous plate of alloy steel, produces unnecessary washing away to experimental soil bin when can avoiding hydrologic cycle. Meanwhile, the highest water level in the test is limited by arranging a water level limiting hole which is communicated with the permeation bin and the water circulation replenishing bin. The soil pressure sensor 303 and the pore pressure sensor 302 are arranged in the soil body in a linear array manner, wherein the soil pressure sensor 303 is used for monitoring the soil pressure of a test soil bin in the test process, and the pore pressure sensor 302 is used for monitoring the evolution of pore water pressure inside the test soil bin in real time.
In one embodiment of the present invention, a laser displacement sensor 304 for measuring the soil surface displacement in real time is further disposed above the test soil bin 8, as shown in fig. 6, the laser displacement sensor 304 includes a laser displacement sensor connecting rod 3041 and a laser displacement sensor 3042, and the laser displacement sensor 3042 is mounted on the laser displacement sensor connecting rod 3041 in a line-type manner. As shown in fig. 2, the laser displacement sensor connecting rod 3041 is installed at the upper parts of the right side plate and the left side plate of the box body through screw holes.
In one embodiment of the present invention, as shown in fig. 7, the ball valve device 205 can control the water supply and drain conditions of the damaged pipe by rotating, so as to achieve the purpose of controlling the water level in the pipe. The arrows indicate the water flow direction, the submerged pump supplies water into the pipe in fig. 7 (a), and the broken pipe is freely drained in fig. 7 (b).
In one embodiment of the present invention, the water-sand separation device in the soil filtering bin 10 adopts a multi-stage filtering mode to ensure that the water-soil mixture flowing back from the damaged pipe is fully collected, soil particles are used for analysis after test, and the filtered water meets the working requirement of the submersible pump on the water quality of the water delivery; as shown in fig. 8, in this embodiment, the water-sand separation device is implemented by using double-layer filter plates 7 with different radii of the leak holes, and a pair of filter plates shown in fig. 8 are directly inserted into the reserved slots of the two side baffles thereof, and strain monitoring assemblies 301 are arranged on each layer of filter plate for monitoring the strain of the filter plates in real time. The water-soil mixture sequentially passes through two filter plates with different diameters of the leak holes, soil particles with different particle diameters are blocked on the filter plates, and the soil particles with different particle diameters are respectively blocked on the two filter plates, so that the filter plates can generate strain under the action of supergravity by the blocked soil particles. The strain monitoring component is pre-installed on the filter plate and used for monitoring the strain of the filter plate in real time, the strain can be calculated to obtain the stress through a mechanical method, and the real-time stress change can accurately describe the escape behavior of soil particles.
As shown in fig. 9, the strain monitoring assembly 301, the pore pressure sensor 302, the soil pressure sensor 303, the laser displacement sensing device 304 and the high-speed camera assembly 305 form a monitoring sensing system; the laser displacement sensor is arranged on the laser displacement sensor connecting rod, so that real-time monitoring of the surface deformation of the foundation soil is realized; the pore pressure sensor 302 and the soil pressure sensor 303 are used for monitoring the real-time water level and the soil pressure of the test soil bin and controlling the circulating water flow of the submersible pump according to the water level information; the strain monitoring assembly 301 is arranged on the water-sand separation device and is used for measuring the strain condition of the water-sand separation device; a high speed camera assembly 305 mounted at the viewing window 1011 of the front panel of the cabinet is used to capture the test procedure in real time.
In one implementation of the invention, after the data measured by the monitoring and sensing system is acquired by the data acquisition center, the size of a damaged gap and the internal and external water level of the damaged pipeline model are controlled by the servo control system. The servo control system adopted in the embodiment is composed of central processing equipment, a servo actuator control unit, a remote controller and a servo controller, wherein after the central processing equipment acquires data of a data acquisition center, the data are processed by the central processing equipment and an action command is fed back, the command can be transmitted to a local servo controller by the servo actuator control unit through the remote controller, and three servo actuators are arranged in a local device and are respectively used for realizing the adjustment of the circulating water quantity and the flowing direction of a water circulation replenishment bin, the switching of the water inlet and outlet functions of a water inlet and outlet control device and the adjustment of the size of a damaged gap of a damaged pipeline model. For example, the power of the submersible pump is controlled by the servo actuator 1, so that the submersible pump completes water circulation at a certain speed to control the water level of the seepage bin, and the effect of controlling the water level outside the pipe in real time is achieved. The ball valve is controlled to rotate through the servo actuator 2, the drainage condition of the damaged pipe is changed, and meanwhile, the submersible pump is controlled to supply water to the inside of the simulated damaged pipe through the ball valve device, so that the experimental simulation of the full pipe flow of the water level in the pipe is realized. The extrusion force of the rubber plug at the end part of the electric push rod to the broken notch is controlled by the servo actuator 3 so as to change the size of the opened broken notch.
In one implementation of the invention, the submersible pump should meet the requirement that the working efficiency of the submersible pump reaches the required water circulation speed under the Ng gravity acceleration. The visible window of the front plate of the box body is made of organic glass with the light transmittance more than or equal to 85%, can resist the soil lateral pressure under the hypergravity and meets the definition requirement. The high-speed camera assembly should meet the requirements of stable and clear shooting under the hypergravity. The laser displacement sensor can ensure the monitoring precision under the supergravity state, and the error of the monitoring system is increased due to the fact that the connecting rod is not deformed excessively. In addition, waterproof measures should be applied between the model box body and the internal structure, and all the bolt connection positions and the plate joints should also be applied, specifically, the waterproof measures should be selected to meet the requirements of model box deformation and strength to adapt to Ng gravity acceleration and partition each bin.
In one embodiment of the present invention, the process of simulating the ground collapse induced by the reciprocating leakage of the damaged buried pipeline by using the centrifugal model test device comprises the following steps:
the preparation stage: filling model soil in a test soil bin 8 of the device, and injecting circulating water in a water circulation replenishing bin 11;
simulation test stage: the method comprises alternately executing the simulation of the water outside the pipe and the water outside the pipe;
in the process of performing the outside-pipe water infiltration simulation, switching the water outlet control device of the damaged pipeline model 2 into a water discharge level, controlling the water circulation supplementing bin 11 to supply water to the infiltration bin 9, and stably controlling the outside-pipe water level by adjusting the height of the water level limiting hole 401 on the bin partition plate; the water in the seepage bin 9 is immersed in the soil body of the test soil bin 8, the water-soil mixture flows into the damaged pipeline model 2 from a damaged notch 202 at the front end of the damaged pipeline model 2, then is discharged from the rear end of the damaged pipeline model 2, and the water filtered and purified by a water-sand separation device in the soil filtering bin 10 enters the water circulation replenishing bin 11 to realize water circulation; in the simulation process, the soil pressure, the water pressure and the soil surface displacement of the test soil bin 8 and the strain condition of the water-sand separation device of the soil filtering bin 10 are monitored in real time, and the real-time loss of soil particles is obtained according to the strain condition;
in the process of performing in-pipe water extravasation simulation, switching a water outlet control device of a damaged pipeline model 2 into a water inlet level, controlling a water circulation replenishment bin 11 to supply water to the damaged pipeline model 2, enabling water in the damaged pipeline model 2 to flow into soil bodies of a test soil bin 8 from a damaged notch 202 at the front end and permeate into seepage bins 9 at two sides of the test soil bin 8, stably controlling the water level outside the pipe by adjusting the height of a water level limiting hole 401 on a bin partition plate, and enabling water in the seepage bins 9 to flow back to the water circulation replenishment bin 11 when the water level outside the pipe reaches the height of the water level limiting hole 401, so as to realize water circulation; in the simulation process, the soil pressure, water pressure and soil surface displacement of the test soil bin 8 are monitored in real time.
In one implementation of the present invention, in the preparation stage, the connection angle between the damaged pipe model 2 and the bin partition plate 4 is changed, so as to achieve the purpose of adjusting the direction of the damaged notch 202 at the front end of the damaged pipe model 2; in the simulation test stage, the size of the broken notch 202 at the front end of the damaged pipeline model 2 is adjusted by the extrusion force of the rubber plug 207 at the end part of the electric push rod to the broken notch 202, specifically:
when the normal service condition is simulated, the electric push rod is controlled to drive the rubber plug 207 at the end part to extend, so that the rubber plug 207 is tightly contacted with the broken notch 202, and the broken notch 202 is completely blocked;
when the damage condition of the damaged opening exists, the electric push rod is controlled to drive the rubber plug 207 at the end part to retract, and the degree of disengagement between the rubber plug 207 and the damaged notch 202 is controlled through the retraction amount, so that the purpose of adjusting the size of the damaged notch 202 is achieved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The centrifugal test device for simulating the buried pipeline reciprocating leakage induced subsidence is characterized by comprising a model box body (1), a damaged pipeline model (2), a servo control system and a monitoring and sensing system, wherein the model box body is divided into a front part and a rear part by a bin partition plate (4), and the bin partition plate (4) is provided with a mounting hole for fixing the damaged pipeline model;
the front part in the model box body is provided with a test soil bin (8) and seepage bins (9) at two sides of the test soil bin, and the front end of a damaged pipeline model in the test soil bin is provided with a damage gap (202) with adjustable size; the rear part in the model box body is provided with a soil filtering bin (10) and water circulation replenishing bins (11) at two sides of the soil filtering bin, the rear end position of the damaged pipeline model in the soil filtering bin is provided with a water inlet and outlet control device, and a water and sand separation device is arranged below the water inlet and outlet control device; the bin partition plate (4) is provided with a water level limiting hole (401) which is communicated with the seepage bin (9) and the water circulation replenishing bin (11);
the servo control system is used for controlling the size of a damaged gap and the internal and external water levels of the damaged pipeline model; the monitoring and sensing system is used for measuring the soil pressure, the water pressure and the soil surface displacement of the test soil bin (8) and the strain condition of the water-sand separation device of the soil filtering bin (10) in real time;
the damaged pipeline model (2) comprises a pipeline main body (201), a pipeline front end sealing cover (203), a pipeline rear end sealing cover (204) and an electric push rod assembly (206); the pipeline main body (201) is fixed in the mounting hole of the bin partition plate (4) through the flange plate (207), the front end sealing cover (203) and the rear end sealing cover (204) of the pipeline are respectively used for sealing the front end and the rear end of the pipeline main body (201), and the breakage notch (202) is positioned on the pipeline main body (201) and close to the front end sealing cover (203) of the pipeline; the electric push rod assembly (206) is arranged on the inner side of the sealing cover (203) at the front end of the pipeline, and the size of the breakage notch (202) is adjusted through a rubber plug at the end part of the electric push rod;
the soil filtering bin (10) and the water circulation replenishing bin (11) at two sides of the soil filtering bin are separated by a pair of baffles (6), and holes for communicating the soil filtering bin (10) and the water circulation replenishing bin (11) are formed in the bottoms of the baffles; the water-sand separation device is fixed in the soil filtering bin (10) through a baffle plate and is positioned below the damaged pipeline model (2).
2. The centrifugal test device for simulating the sinking induced by the reciprocating leakage of the buried pipeline according to claim 1, wherein the water inlet and outlet control device adopts a ball valve device which is arranged on a sealing cover (204) at the rear end of the pipeline and is used for switching water inlet and water outlet of the damaged pipeline model (2).
3. The centrifugal test apparatus for simulating a reciprocating leakage induced subsidence of a buried pipeline according to claim 1, wherein the water-sand separation device is one or more layers of filter plates (7).
4. The centrifugal test device for simulating the sinking induced by the reciprocating leakage of the buried pipeline according to claim 1, wherein a submersible pump (12) is arranged in the water circulation replenishing bin (11), and the submersible pump (12) is respectively connected with a water inlet and outlet control device of the damaged pipeline model and the seepage bin (9) through a controllable water outlet pipeline.
5. The centrifugal test apparatus for simulating a reciprocating leakage induced subsidence of a buried pipeline according to claim 1, wherein said monitoring and sensing system comprises a strain monitoring assembly (301), a pore pressure sensor (302), a soil pressure sensor (303), a laser displacement sensing device (304), and a high speed camera assembly (305);
the pore pressure sensor (302) and the soil pressure sensor (303) are buried in the soil body of the test soil bin (8) in a layered manner in a linear manner; the laser displacement sensing device (304) is arranged above the test soil bin (8) in a linear array manner and is used for measuring the soil surface displacement in the test soil bin (8); the strain monitoring assembly (301) is arranged on the water-sand separation device and is used for measuring the strain condition of the water-sand separation device; the high-speed camera assembly (305) is mounted at a viewing window (1011) of the front panel of the case.
6. The centrifugal test device for simulating a reciprocating leakage induced subsidence of a buried pipeline according to claim 1, wherein the servo control system comprises a servo controller and a plurality of servo actuators, each servo actuator being respectively used for realizing the adjustment of the circulating water quantity and the flow direction of the water circulation replenishment warehouse (11), the switching of the water inlet and outlet functions of the water inlet and outlet control device, and the adjustment of the size of the broken notch (202) of the damaged pipeline model.
7. A test method based on the centrifugal test apparatus for simulating reciprocating leakage induced subsidence of a buried pipeline according to any one of claims 1 to 6, comprising:
the preparation stage: filling model soil in a test soil bin (8) of the device, and injecting circulating water in a water circulation replenishing bin (11);
simulation test stage: the method comprises alternately executing the simulation of the water outside the pipe and the water outside the pipe;
in the process of performing the outside water infiltration simulation, switching a water inlet and outlet control device of the damaged pipeline model (2) into a water discharge level, controlling a water circulation replenishment bin (11) to supply water to a seepage bin (9), and stably controlling the outside water level by adjusting the height of a water level limiting hole (401) on a bin partition plate; the water in the seepage bin (9) is immersed into the soil body of the test soil bin (8), the water-soil mixture flows into the damaged pipeline model (2) from a damaged notch (202) at the front end of the damaged pipeline model (2), then is discharged from the rear end of the damaged pipeline model (2), and the water purified by filtration through a water-sand separation device in the soil filtering bin (10) enters a water circulation replenishing bin (11) to realize water circulation; in the simulation process, the soil pressure, the water pressure and the soil surface displacement of a test soil bin (8) and the strain condition of a water-sand separation device of a soil material filtering bin (10) are monitored in real time, and the real-time loss of soil particles is obtained according to the strain condition;
in the process of performing in-pipe water extravasation simulation, switching a water inlet and outlet control device of a damaged pipeline model (2) into a water inlet level, controlling a water circulation replenishment bin (11) to supply water to the damaged pipeline model (2), enabling water in the damaged pipeline model (2) to flow into soil bodies of a test soil bin (8) from a damaged notch (202) at the front end and permeate into seepage bins (9) at two sides of the test soil bin (8), stably controlling the water level outside the pipe by adjusting the height of a water level limiting hole (401) on a bin partition plate, and enabling water in the seepage bins (9) to flow back to the water circulation replenishment bin (11) when the water level outside the pipe reaches the height of the water level limiting hole (401), so as to realize water circulation; in the simulation process, the soil pressure, the water pressure and the soil surface displacement of the test soil bin (8) are monitored in real time.
8. The test method of the centrifugal test apparatus for simulating a reciprocating leakage induced subsidence of a buried pipeline according to claim 7, wherein in the preparation stage, the purpose of adjusting the direction of a breakage notch (202) at the front end of the damaged pipeline model (2) is achieved by changing the connection angle of the damaged pipeline model (2) and the bin partition plate (4); in the simulation test stage, the size of the broken notch (202) at the front end of the damaged pipeline model (2) is adjusted through the extrusion force of the rubber plug at the end part of the electric push rod to the broken notch (202), and specifically:
when the normal service condition is simulated, the electric push rod is controlled to drive the rubber plug at the end part to extend out, so that the rubber plug is tightly contacted with the damaged notch (202), and the damaged notch (202) is completely blocked;
when the damage condition of the damaged opening exists, the electric push rod is controlled to drive the rubber plug at the end part to retract, and the degree of disengagement of the rubber plug and the damaged notch (202) is controlled through the retraction amount, so that the purpose of adjusting the size of the damaged notch (202) is realized.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210670677.0A CN115165242B (en) | 2022-06-14 | 2022-06-14 | Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced subsidence |
| PCT/CN2023/086065 WO2023241174A1 (en) | 2022-06-14 | 2023-04-04 | Centrifugal test device for simulating process of reciprocating leakage of buried pipe inducing land subsidence, and method |
| US18/388,535 US11940366B1 (en) | 2022-06-14 | 2023-11-10 | Centrifugal testing device and method for simulating ground subsidence induced by buried pipeline leakage and infiltration |
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| CN202210670677.0A CN115165242B (en) | 2022-06-14 | 2022-06-14 | Centrifugal test device and method for simulating buried pipeline reciprocating leakage induced subsidence |
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| US11940366B1 (en) | 2024-03-26 |
| CN115165242A (en) | 2022-10-11 |
| WO2023241174A1 (en) | 2023-12-21 |
| US20240077403A1 (en) | 2024-03-07 |
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